Independent, x-coordinate, input, domain.
Dependent, y-coordinate, output, range.
Domain: {0.5, 1, 4, 6, 8}
Range: {1, 1.5, 10, 12, 18}
Kindly refer to attachment for solution.
Hope it helps ^_^
Answer:
Relation 1 : Not a function
R2 : Function
R3: Function
R4: Not a function
0.375 is 3/8 converted into a decimal, to get that you just divide 8 by 3.